asteroza + cycle   135

ToughSF on Twitter: "Strayton: combined Stirling and Brayton cycles engine that drives a linear magnetic generator with 58% overall efficiency."
Wait a sec, this strayton smells like an aviation turbocompound diesel cycle. The thermoacoustic part is a nice touch, but recent work shows a bad match between linear alternators and thermoacoustic systems (but did show a novel solution using a rectifying bidirectional turbine substituted for the piston)(See Aster Thermoacoustics), but this paper is proposing a triangle shaped loop thermoacoustic system called DELTA (Double-Acting Extremely Light Thermo-acoustic Converter) to overcome a linear piston's limitations.
hybrid  compound  stirling  brayton  cycle  engine  turbocompound  thermoacoustic  powerplant  propulsion  electric  research  technology  NASA 
4 weeks ago by asteroza
Power generator using cycling waste heat hot water/cooling water to drive a shape memory alloy wire actuator piston, which drives a hydraulic transmission and power generator. Made a discovery for high cycle ninitol alloy (10 million versus 1 million cycles for regular NT wire) to make the linear actuator work for industrial applications. Uses direct impingement of hot water and cold water to cycle the actuator though...
nitinol  shape  memory  metal  alloy  materials  science  research  technology  wasteheat  power  generator  linear  actuator  piston  hydraulic  transmission  drive  scavenging  harvesting  high  cycle  fatigue  resistance 
march 2019 by asteroza
Modeling and Experimental Results for Condensing Supercritical CO2 Power Cycles
Interesting work on condensing backend supercritical CO2 power cycles. Notably, need a coldsink less than 31C for liquid recompression to work
condensing  supercritical  CO2  power  cycle  generator  research  technology  liquid  phase 
january 2019 by asteroza
Coming Soon
Uses a closed loop ICE of sorts, using input hydrogen/methane and oxygen along with working fluid argon. Burn in a piston, condense out the water, membrane filter the CO2, and recycle the argon back to the cylinder.
argon  power  cycle  alternative  working  fluid  closed  loop  recycling  ICE  engine  generator  hydrogen  methane  oxygen  oxyfuel 
october 2018 by asteroza
Camcon Auto Ltd, reducing CO2 and NOX emissions from vehicles through innovative actuators
Springless mechanical valve control, via individual electric motor controlled cams for every valve, allowing for all sorts of weirdness like temporary 2 stroke mode, or "12 stroke" roundrobin cylinder deactivation.
automotive  technology  individual  valve  mechanical  cam  digital  control  engine  cycle 
august 2018 by asteroza
Turbo Rocket 8Jul18.pptx - Google Drive
Bringing back the NTTR for another round, this time it looks like it's taking the immense heatsink advantage of LH2 to run a fan/compressor for a SERJ and the turbopumps for an otherwise conventional rocket engine pack. Sorta conceptually similar to RocketLabs doing an end-run by using an electric motor to boost a conventional rocket motor that would have been limited to pressure fed or gas-generator.
NTTR  SCTR  nuclear  thermal  staged  combined  cycle  rocket  engine  space  propulsion  research  technology  SERJ  combustion  supercharged  air  augmented  multimode 
july 2018 by asteroza
Hybrid geared-fan and piston concept could slash fuel-burn
Like old combined cycle aviation diesel designs, this appears to be either a diamond D-16, or perhaps even a deltic triangular configuration. Difference is LP turbine drives geared turbofan, while pistons drive HP compressor with no HP turbine. Makes for a supercharged diesel turboprop of sorts.
general  aviation  propulsion  combined  cycle  diesel  engine  geared  turbofan  GTF  turboprop  supercharger  turbocharger 
may 2018 by asteroza
Special Purpose Nuclear Reactor (5 MW) for Reliable Power at Remote Sites Assessment Report
Report on a brayton air cycle turbine cooled reactor, aka the MegaPower variant of the KiloPower/KRUSTY reactor design
nuclear  reactor  brayton  cycle  air  turbine  cooled  cooling  research  technology  MegaPower  KiloPower 
may 2018 by asteroza
Cyclone Power
External burner/heater for stirling piston hot side, so can basically burn anything that won't clog the hot side heat exchanger. Was going to be demoed on EATER, some kind of land foraging robot that uses available biofuels (grass/sticks it can pick up) to self-power
Schoell  cycle  external  burning  combustion  engine  stirling 
august 2017 by asteroza
OSF | Condensed Publication DRAFT- HOLOS Design 06 23 2017 .pdf
From the designer of CAESAR, a new air cooled nuclear reactor design the fits in a cargo container
pebble  bed  high  temperature  nuclear  reactor  brayton  cycle  power  turbine  generator  air  cooling  compact  container  containerized  subcritical  SMR  modular 
july 2017 by asteroza
GERA Technical Papers |
Nuclear piston engine, using gaseous "fuel" and hydrogen gas moderator, with neutron reflector piston and cylinder. Uses piston top-dead-center compression effects and a "spark" (external neutron source, like an ADSR particle accelerator neutron spallation target, or some sort of cylinder wall embedded neutron source). Wonder if LiquidPiston reverse wankel would also work well here. Negative void coefficient is nice too.
nuclear  nanofuel  internal  engine  piston  reciprocating  plutonium  hexaflouride  hydrogen  gas  otto  cycle  wankel  rotary  power  generator  external  neutron  source  spark  ignition  ADSR  gaseous  pulse  pulsed  core 
june 2017 by asteroza
Neat work on an oxyfuel turbine using supercritical CO2 exhaust as the actual power cycle
toshiba  allam  cycle  oxyfuel  supercritical  CO2  turbine  power  generator  ASU  Delicious 
january 2017 by asteroza
Supercritical Organic Rankine Cycle waste heate recovery generator for marine ga...
Interesting, for marine propulsion applications that use a gas turbine (selected for compactness/high power), exhaust gas waste energy recovery would be better served by a higher efficiency HRSG steam turbine, but the balance of plant of a steam turbine is so large that a supercritical organic rankine cycle, despite the lower efficiency, wins due to compactness pairing with the compact gas turbine.
supercritical  organic  rankine  cycle  power  generator  gas  turbine  exhaust  waste  heat  recovery  marine  Delicious 
november 2016 by asteroza
A synthetic pathway for the fixation of carbon dioxide in vitro | Science
Artificial CO2 fixation cycle (CETCH) made from a combo of 11 enzymes found across animals and plants appears to be 2-3 times faster and 25% more energy efficient than the Calvin cycle, but outputs a weird glyoxylate (which can be further converted to other stuff but...) rather than glucose so now just need to stuff a synthetic bacterium with DNA to build and operate those 11 enzymes to see if it really is better than photosynthesis. Primary boost is replacing RuBisCO with the enzyme ECR for better initial CO2 capture.
synthetic  CO2  carbon  fixation  enzyme  cycle  artificial  photosynthesis  biology  research  technology  optimized  designer  organism  metabolism  Delicious 
november 2016 by asteroza
FHR with FIRES resistance heated firebrick thermal storage to provide peak heating on top of nuclear heating for an indirect fired gas turbine (well, maybe some makeup natural gas in there for direct heating) peaker plant collocated with the reactor.
MIT  FHR  nuclear  reactor  power  generator  NACC  combined  cycle  gas  turbine  peaker  thermal  energy  storage  FIRES  resistance  heating  heated  firebrick  heated  Delicious 
november 2016 by asteroza
Argonne technology puts solar power to work all night long | Argonne National La...
Graphite foam pores holding phase change salt for thermal storage improve thermal transfer for thermal storage. For steam turbine linkage, use magnesium chloride, for higher temperature SCO2 turbines use sodium chloride.
graphite  foam  porous  structure  thermal  storage  CSP  solar  energy  SCO2  cycle  phase  change  PCM  salt  materials  science  research  technology  Delicious 
october 2016 by asteroza
Sentient Technologies LLC | Artificial Intelligence Software | Data Analysis
So, an AI overlay over a corporate BOINC client network. Assuming a corp can eat the added power/heat costs, stealing idle cycles from datacenter (and desktop?) computers might work. Though why does feel like something out of Ghost in the Shell?
idle  cycle  distributed  parallel  computing  software  network  AI  bigdata  startup  Delicious 
june 2015 by asteroza
Nuclear Fuel Cycle Cost Calculator
Only applies to conventional light water nuclear reactors using normal fuel or MOX
nuclear  fuel  cycle  cost  calculator  LWR  PWR  Delicious 
june 2015 by asteroza
Fluoride Salt-Cooled High Temperature Reactor (FHR) Project | CANES
Don't like the pebble fuel, but this is probably a more achievable NACC configuration, as it isolates secondary loop better in case of primary loop leaks, compared to other proposed NACC systems, which use helium gas reactor, with a helium turbine within containment driving an external air compressor also in containment sucking in and then expelling external air through containment which isn't good (which I suppose that might be solvable with a shaft through the containment wall with frangible clutches).
NACC  PB-FHR-pebble  bed  salt  cooled  nuclear  reactor  combined  cycle  indirect  air  heating  gas  turbine  power  generator  research  technology  brayton  steam  bottoming  Delicious 
february 2015 by asteroza
Recent Advances in Power Cycles Using Rotating Detonation Engines with Subcritical and Supercritical CO2
So rocketdyne has been doing interesting RDWE plasma assisted combustors, in this case intended for oxyfuel powerplants with CO2 capture
aerojet  rocketdyne  RDE  RWDE  PDE  rotating  wave  detonation  engine  pressure  rise  combustor  supercritical  CO2  combustion  cycle  oxyfuel  gas  turbine  research  technology  pulse  pulsed  plasma  assist  carbon  capture  Delicious 
november 2014 by asteroza
Mk1 Power Conversion | FHR@UCB
Evolution of the old ANP indirect cycle nuclear turbines, this time around for a fixed ground installation and using mostly unmodified externally heated GE frame 7 gas turbines with cofiring combustor assist for peaking.
NACC  nuclear  air  combined  cycle  power  gnerator  externally  heated  frame  7  GE  gas  turbine  cofiring  ANP  Delicious 
october 2014 by asteroza
Coiled Tube Air Heaters (CTAHs) | FHR@UCB
Interesting molten salt to air (liquid to gas) heat exchanger, intended for auxiliary power generation for a nuclear air combined cycle plant.
CTAH  coiled  tube  air  heat  exchanger  spiral  molten  salt  nuclear  gas  combined  cycle  NACC  hardware  Delicious 
october 2014 by asteroza
Our solar team sets a hot and steamy world record | News @ CSIRO on
Demo of a direct supercritical steam cycle solar thermal power generator. Naturally, this is a direct steam heating cycle, so no thermal storage to ride out shadows and the night...
CSIRO  proof  direct  supercritical  steam  cycle  solar  thermal  concentrating  power  generator  CSP  green  energy  proof-of-concept  Delicious 
june 2014 by asteroza
Looks like they are trying to make a hybrid pulsejet/rocket for suborbital spaceplane, maybe.
japan  hybrid  pulsejet  rocket  space  air  breathing  propulsion  research  technology  aerospace  spaceplane  engine  suborbital  PDE  combined  cycle  Delicious 
january 2014 by asteroza
ACT-RPR-NPS-1107-NTER-paper-final - ACT-RPR-PRO-1107-LS-NTER.pdf
NTER, a nuclear thermal electric rocket design. Uses LH2 propellant to cool a helium brayton cycle turbine fed by a NTR that heats hydrogen and helium, then tries to supercharge the supersonic nozzle exhaust with an induction loop (which seems to require cesium seeding in the exhaust??). Also has optional oxygen feed, to emulate LANTRN. Seems like you could do better with the NTR feeding a VASIMR though...
cycle  technology  turbine  thermal  electric  induction  acceleration  LH2  space  ESA  research  propulsion  brayton  nuclear  LANTRN  rocket  loop  generator  power  helium  NETR  LOx  augmented  nozzle  MHD  Delicious  aerojet  NTR  NERVA  bimodal  thrust  heating  turboinductor  turbo-inductor  NTER  supercharger  turbocharger  augmentation  heater  resistance  ohmic  inductive 
september 2013 by asteroza
f.lux: software to make your life better
Software for red shifting computer interfaces at night to make it easier to transition to sleep. Apparently blue light tends to make us more alert (as a component of a full spectrum white light trying to emulate the sun), sun reducing the amount of blue, or the alternative being wearing blue filter sunglasses at night (which apparently is a thing and seems to also work if worn the hour before bed)
iPad  cycle  app  redshift  circadian  mac  windows  solar  sleep  OSX  linux  iPhone  software  blue  rhythm  mimic  illumination  lighitng  iOS  light  Delicious 
august 2013 by asteroza
Efficient Generation of H2 by Splitting Water with an Isothermal Redox Cycle
Interesting work showing no temperature swing, only the presence of steam, is the determinant in a redox reaction supporting water/steam cracking for hydrogen production at 1350C which is both lower than expected and avoids thermal cycling the metal oxide catalyst.
water  reaction  cycle  hercynite  isothermal  oxidation  solar  splitting  production  gas  redox  oxide  metal  hydrogen  cracking  reduction  steam  Delicious 
august 2013 by asteroza
Sagita - Home
Looks like a semi-hot cycle helicopter, but instead of a potentially more complicated tip jet drive, it appears to use dual contra rotating direct drive turbines to spin the rotors, exhausting into the inter-disk area of the rotor hub. That exhaust choice is a bit odd though, but it might increase local air velocity over the blades.
rotor  direct  helicopter  aerospace  cycle  technology  turbine  semihot  coaxial  aviation  drive  hot  VTOL  Delicious 
june 2013 by asteroza
太陽光の熱を朝日から夕陽まで回収し効率よく発電:報道発表資料|2013年 プレスリリース|理化学研究所
Riken's press release on the Fresnel lens solar thermal wankel rotary heat engine. Apparently the lens tech is fairly advanced, being developed as a telephoto lens for observing high energy cosmic rays, with high optical transparency and a surface roughness less than 20nm. They used a three sided lens structure (top plate and two vertical plates), called a "Fresnel Sun House" to gather light well onto a T shaped thermal absorber/heat exchanger, even when the sun is close to the horizon at sunrise/sunset.
absorber  concetrator  cycle  thermal  optics  engine  green  plate  rotary  wankel  solar  heat  lens  research  japan  Riken  generator  power  CHP  fresnel  exchanger  energy  rankine  Delicious 
january 2013 by asteroza
Apparently have a wankel rotary engine design that runs a rankine cycle using low grade waste heat. They did a demo with Riken using Fresnel lenses to create solar thermal heat concentrator setup to feed the wankel engine.
cycle  hardware  engine  green  RHE  rotary  wankel  heat  japan  power  generator  devices  energy  rankine  electronics  Delicious 
january 2013 by asteroza
The Superjet: Engineers at GE Aviation Are Building the Ultimate Jet Engine | GE Reports
Thing is, the tech path for this leads to a similar family of engines, like the J58 that powers the SR-71 (two path engine with outer duct not behind a compressor and used as a ramjet), and SERJ (technically a two path where you have part of the compressor flow go to a combustor and turbine segment, while the rest flows to a ramjet combustor only). Probably the basic difference between ADVENT and SERJ is a lack of subsonic ramjet combustor and an air bleed path.
ratio  bypass  research  technology  propulsion  aerospace  aviation  engine  turbojet  cycle  variable  military  ADVENT  GE  Delicious 
january 2013 by asteroza
SuperCritical Technologies | Mobile Power Plants
This appears to be the company commercializing/partnering with Sandia for supercritical CO2 brayton cycle turbine technology.
technology  research  fluid  transfer  heat  cooling  generator  power  cycle  brayton  dioxide  carbon  CO2  supercritical  Sandia  Delicious 
september 2012 by asteroza
NASA - Robotic Asteroid Prospector (RAP) Staged from L-1: Start of the Deep Space Economy
The demo of vacuum mining techniques and the combined cycle solar thermal/solar electric propulsion is interesting. Run a very hot solar brayton cycle turbogenerator, with waste heat dumped via a large radiator, or a thermal heat exchanger rocket chamber nozzle.
NASA  RAP  EML1  L1  robot  asteroid  prospector  vacuum  mining  space  infrastructure  research  combined  cycle  solar  thermal  electric  propulsion  Delicious 
september 2012 by asteroza
ReGen Power Systems - Low Temperature Waste Heat Stirling
Some sort of high efficiency low heat/waste heat technology. They have 250 degree waste heat engine designed for industrial waste heat, and a 100 degree version designed to mate with steam condensers.
low  temperature  waste  heat  recovery  stirling  cycle  power  generator  green  energy  Delicious 
august 2012 by asteroza
19960021025_1996043871.pdf (application/pdf Object)
RIME (Rocket Induced Magnetohydrodynamic Ejector) rocket design for an electric air breather rocket ejector ramjet of sorts. Robs power from the rocket exhaust via MHD generator to power the generator magnets, the air ionizer, and the MHD accelerator.
RENE  RIME  space  spacecraft  aerospace  aviation  research  technology  propulsion  rocket  MHD  generator  accelerator  cycle  electric  air  ejector  ramjet  Delicious 
june 2012 by asteroza
Propulsion Systems for small and light aircrafts | Micro-Turbofan™, Micro-Turboalternator™, Distributed Lift
The image is not helping in visualizing a power turbine occurring IN FRONT OF a combustor, especially how one transfers compressed air from the compressor to the combustor through the turbine wheel. Seems they are doing a trick where they use a centrifugal compressor, and rather than having a fixed stator correcting the swirl, they allow power recovery of the swirl directly to power the bypass fan ring (pre-combustion power turbine), then move the air towards the combustor (secondary compressor here too?), then on to the post combustion power turbine which is shaft linked to the first stage compressor. So they are probably trying to get too much pressure from the stage compressor, and trying to avoid a HP/LP post combustion power turbine setup. Attractive for some uses.
microturbofan  microturbine  engine  gas  turbine  microturboalternator  power  generator  distributed  propulsion  lift  fan  liftfan  hot  cycle  Delicious 
may 2012 by asteroza
Wasabi Energy
Appears to use a kalina cycle ammonia phase change heat engine with a microturbine for small scale low grade heat applications, such as bottoming cycles.
kalina  cycle  low  temperature  heat  engine  ammonia  bottoming  grade  geothermal  binary  power  generator  green  energy  microturbine  Delicious 
february 2012 by asteroza
ASME 2011 Small Modular Reactors Symposium - SMR2011
Interesting papers (6520 and 6554) about a hybrid nuclear/combustion gas turbine plant, Using a helium gas brayton cycle turbine to run a decoupled air compressor for a linked coal gasification syngas powered combustion turbine (with likely combined cycle steam plant which could also be linked with the nuclear side of the plant). Also talking about integrated process heat and synfuel production. Natural gas carrot to try to get nuclear synfuel production capabilities? There is some CAES talk since the air compressor is decoupled which would allow storage, and nuclear heat is available for air reheat when releasing from storage.
hybrid  helium  nuclear  reactor  gas  brayton  cycle  turbine  coal  gasification  syngas  combined  decoupled  air  compressor  power  generator  concept  design  CAES  compressed  air  storage  energy  Delicious 
february 2012 by asteroza
SkySails GmbH - SkySails Power System
Interesting. A pull/retrieve power stroke based, figure 8 racetrack pattern autonomous flight pull stroke, offshore floating buoy based parafoil wing kite power generator system. System will need a rather large energy accumulator/battery/flywheel/capacitor to even out the energy output from an array of these though. Could do that at the array level, or at the individual buoys. Buoy based does not favor all electric flywheels (maybe CVT clutch coupled mechanical flywheels), clutched air compressor based systems would also work, capacitors probably would be undesirable though. That water pump spherical anchor may be favorable if using a TLP platform style pipe tendon for moorings
skysails  offshore  high  altitude  airborne  kite  parafoil  parasail  wind  power  generator  green  energy  germany  europe  EU  stroke  tether  pull  retrieve  cycle  Delicious 
september 2011 by asteroza
Clean Energy Systems, Inc. | Kimberlina
Interesting use of rocket combustor technology to run a oxyfuel combustor power generator, where the rocket exhaust is water injected to make more steam, then the whole exhaust (which is basically only steam and CO2) is run through a conventional steam turbine, and steam condensers make CO2 extraction easy. There is the possibility of doing a MHD topping cycle as well since the rocket combustor operates near stoichiometric so is hot enough for thermal plasma.
oxyfuel  rocket  combustor  combined  cycle  CC  methane  coal  gasification  syngas  IGCC  power  generator  research  CO2  carbon  capture  CCS  steam  turbine  Delicious 
july 2011 by asteroza - Oxy-MHD
"Topping Ready" oxyfuel topping cycle, which is an oxyfuel combustor integrated with a topping cycle MHD. The recent improvements in UV lasers ionizing oxidizer and fuel may make it possible to seed the MHD plasma without sacrificial seeds, but these guys make the argument that stoichiometric combustion of an oxyfuel setup gets hot enough for thermal plasma anyways, reducing (but not eliminating?) the need for seeding. But they seem to use water/steam injection in the combustor itself, ostensibly to keep it from melting (why not a reverse vortex combustor with oxygen in the outer vortex and fuel center injection?) and to provide the majority of the working fluid volume as steam for a conventional steam turbine, but the MHD variant will reduce the water injection in exchange for MHD power extraction causing cooling.
oxyfuel  stoichiometric  oxygen  combustor  MHD  topping  cycle  power  generator  natural  gas  methane  coal  gasificiation  syngas  IGCC  CC  Delicious 
july 2011 by asteroza
GE Combines Natural Gas, Wind, and Solar - Technology Review
So the idea is colocate a wind turbine array in the solar thermal heliostat field, and use the solar thermal heat to boost the steam turbine in a natural gas combined cycle rig. No mention of thermal heat storage from the solar thermal system, but considering the gas turbine can operate in peaking mode, there's less of an incentive to do so. The gas turbine also can do some load following moves to buffer the wind turbine output to take care of the wind power variability issue. It appears to spec for dry cooling the steam turbine. The core concept of a heavily integrated multisource powerplant is intriguing, and does cut the cost of some equipment (mainly steam turbines/generators, and transformers, and controls). However, if the integration is too high, then later expansions or uprates will unbalance the optimizations, potentially to the point that it may not be worth the costs.
turkey  GE  hybrid  natural  gas  turbine  combined  cycle  steam  HRSG  dry  cooling  concentrating  solar  thermal  wind  power  generator  green  energy  integrater  powerplant  Delicious 
june 2011 by asteroza
Using a scroll compressor in reverse for a compact rankine cycle waste heat binary power generator.
Ulvac-Riko  japan  rankine  cycle  binary  R134a  waste  heat  power  generator  scroll  expansion  turbine  Delicious 
june 2011 by asteroza
CO2-Free Engine Powers Up
A magnesium burning steam cycle engine, with a proposed regeneration of magnesium reactant from magnesium oxide cycle output via solar powered laser. I wonder what the energy costs of regenerating the reactant are, because the laser is energy intensive, and there probably needs to be some mechanical treatment of the magnesium to make it a fine powder.
mitsubishi  magnesium  injection  cycle  MAGIC  steam  hydrogen  engine  research  oxide  laser  recycling  regeneration  green  energy  Delicious 
june 2011 by asteroza
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